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View Compilation Error

0_0_37392016_30421.cpp:12:10: error: reference to 'rank' is ambiguous
 bool cmp(rank a,rank b){
          ^
0_0_37392016_30421.cpp:6:8: note: candidates are: struct rank
 struct rank{
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37392016_30421.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_37392016_30421.cpp:12:17: error: reference to 'rank' is ambiguous
 bool cmp(rank a,rank b){
                 ^
0_0_37392016_30421.cpp:6:8: note: candidates are: struct rank
 struct rank{
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37392016_30421.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_37392016_30421.cpp:12:23: error: expression list treated as compound expression in initializer [-fpermissive]
 bool cmp(rank a,rank b){
                       ^
0_0_37392016_30421.cpp:12:24: error: expected ',' or ';' before '{' token
 bool cmp(rank a,rank b){
                        ^
0_0_37392016_30421.cpp: In function 'int main()':
0_0_37392016_30421.cpp:23:2: error: reference to 'rank' is ambiguous
  rank a[N];
  ^
0_0_37392016_30421.cpp:6:8: note: candidates are: struct rank
 struct rank{
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37392016_30421.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_37392016_30421.cpp:25:13: error: 'a' was not declared in this scope
  while(cin>>a[x].name) {
             ^
0_0_37392016_30421.cpp:75:7: error: 'a' was not declared in this scope
  sort(a,a+x,cmp);
       ^


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